I'm aware of the swallowing hazard. I keep all batteries in a secure location in the house, or my range bag, EDC backpack, or in some AR pistol grips which are obviously secured. We have no small children at the house and no grandchildren yet. I think the ziploc bags would be difficult for a child to open as you have to pinch and roll them due to how short opening is. It takes a bit of strength to pull off.